Is he still a Catholic? (he hasn't been excommunicated)
And the second question is, is he a Christian? Was he ever a Christian? (according to reformed theology, the answer is no - he is not now, nor never was a Christian)
In other words, if I go to an airport, does that make me an airplane?
As far as evidence, there is plenty. But you would have to take my word for it, because the evidence is primarily internal. Oh, there is plenty of external evidence, but you would have an alternative explanation. That's why it's called a "faith" not a "science" and will never be proven scientifically.